Im confident provably fair will be that standard among pretty much all online casinos.
What is really going to be interesting to is to see when big casino game software sellers like softwiss come up with their own solutions and what they are gonna look like.
It might just be something wehave not yet seen before in this form.
Im not so sure, casinos that do not use bitcoins generally dont have any way to verifiy if they are fair or not, i dont know if you know any casino that has provably fair and uses normal currencies, i dont, im not saying it does not exist but its definitely not common and people dont know about it and if people dont know about it the casino owners wont have to implement it any time soon.